WO2006060756A2 - Procede de stabilisation de biosolides - Google Patents

Procede de stabilisation de biosolides Download PDF

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Publication number
WO2006060756A2
WO2006060756A2 PCT/US2005/043870 US2005043870W WO2006060756A2 WO 2006060756 A2 WO2006060756 A2 WO 2006060756A2 US 2005043870 W US2005043870 W US 2005043870W WO 2006060756 A2 WO2006060756 A2 WO 2006060756A2
Authority
WO
WIPO (PCT)
Prior art keywords
biosolids
biosolid
sludge
chlorine dioxide
orp
Prior art date
Application number
PCT/US2005/043870
Other languages
English (en)
Other versions
WO2006060756A3 (fr
Inventor
Frederick P. Mussari
Wilfried J. Schmitz
Original Assignee
Bio-Chem Resources
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bio-Chem Resources filed Critical Bio-Chem Resources
Priority to CA002589904A priority Critical patent/CA2589904A1/fr
Publication of WO2006060756A2 publication Critical patent/WO2006060756A2/fr
Publication of WO2006060756A3 publication Critical patent/WO2006060756A3/fr
Priority to IL183691A priority patent/IL183691A0/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/004—Sludge detoxification
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/08—Reclamation of contaminated soil chemically
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/06—Treatment of sludge; Devices therefor by oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection

Definitions

  • the present invention relates, generally, to municipal or agricultural wastewater treatment and more particularly relates to an improved method of biosolids treatment wherein vector attraction reduction and stabilization are accomplished by utilizing a chemical oxidant such as chlorine dioxide.
  • U.S. Pat. No. 5,281,341 entitled “Sludge Treatment Process” describes a method of treating a liquid waste or process stream that includes a sludge component and that enhances sludge treatment or stabilization.
  • the sludge is acidified to a pH of less than 4.0 in an oxygen enriched environment.
  • a nitrous acid level is maintained sufficiently high to kill pathogens, in a closed chamber so that the nitrous acid won't be lost from the chamber through volatilization.
  • U.S. Pat. No. 5,281,341 is incorporated herein by reference.
  • Injection relates to an apparatus for treating sewage sludge in a hyperbaric vessel in which the sludge is oxygenated by injecting an oxygen-rich gas into the sewage sludge and then dispersing the mixture of sludge and oxygen-rich gas into the upper portion of a hyperbaric vessel for further interaction with an oxygen-rich atmosphere.
  • the oxygen-rich gas is injected into the sewage sludge by delivering the gas to a combination gas and sludge mixing and dispersing assembly.
  • This patent teaches a process to stabilize municipal sludge by acidifying the sludge to a pH of between 2.5 and 3.5 in the presence of 200 to 300 ppm (parts per million) of oxygen at a pressure of 60 psi and a pure oxygen stream containing 3.0% to 6.0% ozone for a period of 30- 90 minutes.
  • the process was ineffective against viruses and Ascaris eggs.
  • the problem of disinfection and stabilization of municipal and agricultural wastes is global.
  • the present invention teaches a method that offers significant performance and economic advantages over known methods to make the treatment of this material practical for both municipalities and agricultural operations.
  • the present invention provides an improved method of treating liquid waste or process streams that include a sludge component and that enhance sludge disinfection and stabilization.
  • Chlorine dioxide is known to be a strong oxidant and a potent biocide. In testing for disinfection of biosolids, it was discovered that while capable of inactivating bacteria and viruses, chlorine dioxide alone is not able to inactivate Ascaris eggs at concentrations as high as 1000 ppm. Non-charged chemical species are capable of penetrating the shell of ascaris eggs under certain conditions and Nitrous acid is capable of Ascaris inactivation in biosolids at concentrations above 400 mg/L in a closed system.
  • the non-ionic, or non-charged, species of a chemical in a waste stream can be maintained by controlling the pH and/or ORP of the mixture.
  • chlorine dioxide has a number of unexpected advantages over ozone for this purpose. While ozone is a more powerful oxidant than chlorine dioxide, chlorine dioxide is a more specific oxidant and is able to raise and maintain the ORP of a sludge sample for a long enough period of time to allow inactivation of bacteria, viruses, and Ascaris eggs.
  • the invention relates to the use of chlorine dioxide to control ORP in sludge, thus increasing the performance of disinfection due to non- charged chemical species, as well as through the performance of the chlorine dioxide itself as a disinfectant.
  • the chlorine dioxide has an added benefit of enhancing the stability of the end product. This method yields a significant reduction in a biosolid's vector attraction in a short period of time.
  • the present invention provides an improved method of treating liquid waste or process streams that include a sludge component and that enhances sludge disinfection and stabilization.
  • Chlorine dioxide is known to be a strong oxidant and a potent biocide. (ref).
  • a system for the disinfection of biosolids to meet EPA Class A standards, it was discovered that the system was also able to reduce vector attraction and induce stability in treated biosolids through reduction of volatile solids content.
  • Testing has demonstrated that volatile solids (VS) reductions ranging from 40-90% can be achieved using this method.
  • vector attraction reduction can be accomplished by biological processes which breakdown volatile solids, thus reducing the available food nutrients for microbial activities
  • the discovery of a chemical method to accomplish this has profound implications on the design of wastewater treatment facilities in that it can eliminate the biological processes, leaving more available nutrients in the remaining solids for beneficial use.
  • the process also greatly reduces the volume of biosolids generated, as the reduction in volatile solids results in lower total solids production.
  • a chemical oxidant such as chlorine dioxide
  • Stability is generally defined as the point at which food for rapid microbial activity is no longer available.
  • biosolids which are stable generally meet vector attraction requirements, there are conditions which can disrupt this stability, such as cell lysis caused by mechanical factors such as vacuum drying or high speed centrifugation, which renders the material unstable and attractive to vectors.
  • material which does meet vector attraction requirements is not necessarily stable, and is still capable of producing odors and sustaining bacterial growth, both pathogenic and nonpathogenic.
  • the subject invention is directed to novel methods of treating agricultural or municipal biosolids.
  • the subject methods utilize a chemical oxidant to reduce vector attraction to, and stabilize, biosolids.
  • the addition of the oxidant is carried out in a closed vessel (tank or pipe) so that the volatile organics emitted can be filtered or otherwise removed to prevent odors.
  • Sufficient contact time is provided to allow for vector attraction reduction, which can occur in a matter of minutes, and to induce stability, which can take a longer time, up to several hours.
  • the biosolids are at a relatively neutral pH (5-9) at the time of treatment. Further, when the chlorine dioxide level is less than 50 parts per million, stability may be induced in less than 2 hours.
  • Chlorine dioxide levels of up to 1% may be used, but may be effectively prohibitive over about 100 ppm, due to usage restrictions, handling concerns, and treatment costs.
  • the solids level of the waste stream is preferred to be less than 7% suspended solids, although it may be conducted with any level of suspended solids.
  • the present process can produce biosolids that meet vector attraction reduction requirements within 2-4 hours, and are biologically stable.
  • the controlling element of the process is based around the effect that chlorine dioxide has on the volatile solids in the biosolids.
  • This process is capable of stabilizing raw or semi-stabilized biosolids, or of reducing attraction and inducing stability in material that has been disinfected in another process and has been rendered unstable by mechanical means.
  • biosolids are generally stabilized by one of the following methods:
  • the present method of stabilization and vector attraction reduction for municipal or agricultural biosolids has significant advantages in both time savings and economic savings for municipalities and other wastewater treatment operations. Energy demands of a municipal wastewater plant can account for 30-50% of the total demand of a municipality. This method offers tremendous economic savings in this regard, by reducing the amount of time and energy necessary to effect biosolids stabilization and a reduction in vector attraction.
  • the stability of treating biosolids can be controlled by the pre-digestion processes, such as aerobic or anaerobic mesosphilic digestion.
  • the oxidation step can enhance the stability of the resulting biosolids since the mixed oxidants should not lyses cells. Respirometer analysis was conducted to assess stabilization of the end product.
  • the ultimate goal is to produce a biosolid that meets Class A standards for disinfection and stability.
  • the resulting biosolid may then be land applied or may have other uses as a fertilizer or soil amendment. If the process proves effective, it may also prove useful in the treatment of manure, waste material from agricultural applications, shipboard wastes such as grey and black water and medical waste materials.
  • the sludge is acidified to a pH of between 2.5 and 3.5.
  • the nitrous acid level should be greater than 400 parts per million, and the pathogen kill is in about 2-12 hours.
  • the ORP of the sludge is maintained at +200 - +600 mV.
  • the solids level of the waste stream is less than 7% suspended solids.
  • the nitrous acid level is in excess of 1500 milligrams per liter and the pathogen kill is in 4 hours or less.
  • An embodiment of the present process may produce a Class A disinfected/stabilized biosolids within 4 hours.
  • This process produces a disinfected/stabilized-thickened biosolid that yields a Class A biosolids product.
  • the process uses a low pH (between 2 to 3, for example) utilizing a sodium nitrite/sodium bisulfate to both disinfect and stabilize.
  • the controlling element of the process is based around the oxidizing potential of nitrite (NO 2 " ). In an acidic environment; this oxidizing reaction is applied to the residual biosolids fed through the process.
  • the acidic conditions are achieved by dosing sodium bisulfate solution into the liquid biosolids while simultaneously dosing nitrites in the form of sodium nitrite solution.
  • the ORP is controlled utilizing chlorinated mixed oxidants (chlorite-hypochlorite/ chlorine dioxide). These are then mixed together for approximately 30 to 120 minutes in a batch reactor vessel where pathogenic organisms are inactivated.
  • an unstabilized biosolids having a pH of 6.0 is contacted with 50 ppm of ClO 2 .
  • a contact time of 2 hours yields a stabilized, thickened biosolid and a significant reduction in vector attraction, due to a substantial decrease in volatile solids.
  • sodium nitrite under pH at 3 was used to disinfect aerobically or anaerobically digested municipal sludges having a solids percentage in the range of 0.1% to about 10.0%.
  • the acidic conditions were achieved by dosing sodium bisulfate solution into the sludges, while simultaneously dosing mixed oxidants (sodium hypochlorite, sodium chlorite and chlorine dioxide) to control ORP levels ranging from 300 to 600 mv.
  • the chlorite-hypochlorite added to the acidified sludge provides in-situ generation of chlorine dioxide.
  • 1500 mg/L of nitrite in the form of sodium nitrite solution was added into the system. These were mixed together in a closed system.
  • the municipal aerobically or anaerobically digested biosolids were spiked with pathogenic spikes and also monitored for indicator organisms, Aerobic endospores and Somatic bacteriophages.
  • one duplicate and one control were conducted for QA/QC purposes.
  • the treated sludges were collected in polyethylene bottles and neutralized using 6 N sodium hydroxide.
  • the efficiency of disinfection was illustrated by percentage of viability of Ascaris eggs in the control and after the treatment.
  • the controlled parameters were tested to establish a matrix of nitrous acid treatment for inactivating Ascaris eggs.
  • the parameters include pH, temperature, ORP, contact time, solid content and pressure.

Abstract

L'invention concerne un procédé mettant en oeuvre du dioxyde de chlore et, éventuellement, de l'acide ou d'autres espèces chimiques non chargées pour le traitement de biosolides, aux fins de destruction de pathogènes. Le procédé met en oeuvre du dioxyde de chlore afin de moduler le ORP de la matrice. Dans un mode de réalisation, le procédé selon l'invention consiste à acidifier les boues (biosolides), de manière à obtenir un pH inférieur à 4,0 et à ajouter de l'acide nitreux aux fins de désinfection améliorée dans un système fermé, de manière à empêcher la volatilisation.
PCT/US2005/043870 2004-12-03 2005-12-05 Procede de stabilisation de biosolides WO2006060756A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002589904A CA2589904A1 (fr) 2004-12-03 2005-12-05 Procede de stabilisation de biosolides
IL183691A IL183691A0 (en) 2004-12-03 2007-06-05 Biosolids stabilization process

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US63269304P 2004-12-03 2004-12-03
US60/632,693 2004-12-03

Publications (2)

Publication Number Publication Date
WO2006060756A2 true WO2006060756A2 (fr) 2006-06-08
WO2006060756A3 WO2006060756A3 (fr) 2006-10-12

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PCT/US2005/043870 WO2006060756A2 (fr) 2004-12-03 2005-12-05 Procede de stabilisation de biosolides

Country Status (4)

Country Link
US (1) US20060151400A1 (fr)
CA (1) CA2589904A1 (fr)
IL (1) IL183691A0 (fr)
WO (1) WO2006060756A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2785538C (fr) * 2009-12-24 2019-09-24 Bcr Environmental Corporation Digestion amelioree de biosolides dans des eaux usees
WO2011097554A2 (fr) * 2010-02-05 2011-08-11 Bcr Environmental, Llc Traitement d'eau résiduaire à faible rejet de phosphore
WO2011130553A2 (fr) * 2010-04-14 2011-10-20 Bcr Environmental, Llc Efficacité de désinfection améliorée d'un traitement des eaux usées

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2182920A (en) * 1985-06-25 1987-05-28 Aquapure Systems Ltd Primary sewage sludge treatment process
US5234596A (en) * 1991-01-25 1993-08-10 Licencia-Holding S.A. Process for composting organic waste or sewage sludge controlled by monitoring exhaust air

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4936983A (en) * 1989-09-01 1990-06-26 Long Enterprises, Inc. Sewage sludge treatment with gas injection
US5281341A (en) * 1991-08-09 1994-01-25 Administrators Of The Tulane Educational Fund Sludge treatment process
US5989497A (en) * 1997-07-31 1999-11-23 Labonte, Jr.; Roland R. Process and apparatus for deodorizing malodorous substances with a chlorine dioxide-containing composition
US5984993A (en) * 1998-03-20 1999-11-16 Vulcan Materials Company Method and composition for odor control
US6406510B1 (en) * 1999-12-09 2002-06-18 Unified Environmental Services Group, Llc Methods for treating wastewater sludge

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2182920A (en) * 1985-06-25 1987-05-28 Aquapure Systems Ltd Primary sewage sludge treatment process
US5234596A (en) * 1991-01-25 1993-08-10 Licencia-Holding S.A. Process for composting organic waste or sewage sludge controlled by monitoring exhaust air

Also Published As

Publication number Publication date
US20060151400A1 (en) 2006-07-13
CA2589904A1 (fr) 2006-06-08
IL183691A0 (en) 2009-02-11
WO2006060756A3 (fr) 2006-10-12

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